Draw debug message during tick?

Development Rendering
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At the beginning of my game, I have a number of computations to complete that take a fair amount of time. I’ve tried writing to the screen to notify my users how the computation is proceeding with the following,

GEngine->AddOnScreenDebugMessage(-1, 15.0f, FColor::Red, FString::Printf(TEXT("Computing %f"), percent));

But none of them render until after the tick is completed. Is there any way to render a debug message during a tick? I’ve also tried the following,

GEngine->GameViewport->GetGameViewport()->GetDebugCanvas()->DrawShadowedString(100, 100, TEXT("Test"), Font, FLinearColor::Red, FLinearColor::Black);
GEngine->GameViewport->GetGameViewport()->GetDebugCanvas()->Flush_GameThread();

with no luck. Is there an easy way to do this that I’m missing?